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structural

Sill

The horizontal masonry element that forms the bottom of window and door openings, designed to shed water away from the opening and support the weight above. Sills typically slope outward and may include a drip edge to prevent water from running back toward the wall. Proper sill design and installation are critical for preventing water infiltration.

Related Keywords

sill
window sill
door sill
water shedding

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Part of our comprehensive masonry glossary